No major photo-shopping. Minor editing such as exposure, contrast and such for small fixes is acceptable.

Capture date rules:

No restrictions.

Additional rules:

My ambiguity in the theme is intentional: I do not want to limit users to just one specific range of the spectrum, all I am proposing is that the main concept be somewhere in the vicinity of green. This means, if it's getting too close to blue or brownish, that's out of the color range I am suggesting.